fill an matrix from another matrix

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Noe alvarado 2012-4-23

Hi I have a matrix M

M11 M12 M13 M14

M21 M22 M23 M24

M31 M32 M33 M34

M41 M42 M43 M44

M51 M52 M53 M54

And i want to fill the matrix W with matrix M as:

M13 M14 (M11*M14 - M12*M13)

M23 M24 (M21*M24 - M22*M23)

M33 M34 (M31*M34 - M32*M33)

M43 M44 (M41*M44 - M42*M43)

M53 M54 (M51*M54 - M52*M53)

Walter Roberson 2012-4-23

W = [M(:,[34]), M(:,1)*M(:,4)-M(:,2)*M(:,3)];

Noe alvarado 2012-4-23

i have the next problem

>> M = [ 1 2 3 4; 1 2 3 4; 1 2 3 4; 1 2 3 4;4 3 2 1];

>> W = [A(:,[34]), A(:,1)*A(:,4)-A(:,2)*A(:,3)];

??? Index exceeds matrix dimensions.

My matrix M is the 5X4

And matrix W i want to be 5X3

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